39results about How to "Large power adjustment range" patented technology

The invention discloses a circuit and a method of a resonant network, and in particular discloses a power conversion circuit. The power conversion circuit includes: a square wave generator, a resonant network, a transformer and a controller. The square wave generator is used to generate square wave power. The resonant network is used to receive the square wave power and output the first resonant power. The resonant network includes capacitors, inductors and controllable capacitive devices. The transformer is connected to the controllable capacitive device for receiving the first resonant power and outputting the second resonant power. The rectified second resonant power is provided to the load. Based on the comparison result of the threshold signal and a signal calculated according to at least one detection signal of the load, the controller is used to generate a switch signal and provide it to the controllable capacitive device. The invention also discloses a method for controlling the power conversion circuit and the resonant network.

The invention relates to a digital constant power high-voltage plasma power supply, comprising an electromagnetic interference filter circuit, a soft start circuit, a single-phase rectifier circuit, a filter energy storage circuit, a full bridge circuit, an LLCC resonance circuit, a power voltage sampling circuit, and a power current sampling circuit. circuit, digital control circuit, MOSFET drive circuit, RS485 communication circuit. The input voltage is connected to the single-phase rectifier circuit through an electromagnetic interference filter circuit, and a DC voltage is formed through a filter energy storage circuit, which is connected to a full-bridge circuit for chopping, and then connected to an LLCC resonant circuit for oscillation filtering, and subsequently connected to a high-voltage transformer for output; The soft-start circuit is connected to the single-phase rectifier circuit, the power voltage sampling circuit and the power current sampling circuit are connected to the digital control circuit to provide closed-loop sampling calculation parameters, the digital control circuit is connected to the full-bridge circuit through the MOSFET drive circuit, and the digital control circuit is connected to all Describe the RS485 communication circuit.

The invention discloses a full-superconducting primary excitation linear generator for direct-drive type wave power generation. The full-superconducting primary excitation linear generator comprises a primary stator and a secondary mover, wherein the primary stator comprises multiple groups of stator units arranged in a straight line; each stator unit comprises a U-shaped core, primary armature windings and primary exciting windings; the U-shaped core comprises two primary cores; an opening of the U-shaped core faces the secondary mover; the primary armature windings are arranged in the primary cores; the primary exciting windings are arranged in the U-shaped core; the secondary mover is the core which does not contain a winding and has a cogging structure; and a corresponding cogging structure is arranged on each primary core. According to the full-superconducting primary excitation linear generator, an arc-shaped structure exciting winding sleeves the outside of each primary core; and a cooling system does not move, so that the complexity level is reduced. The magnetic field conversion rate and the terminal voltage can be increased by a multi-tooth structure secondary; the defect of a low low-speed voltage is compensated; and by unequally-spaced teeth, the voltage frequency and amplitude generated when the generator moves to the end part are increased by reducing the end-part tooth pitch.

The present invention provides a black start method and application of a cascaded energy storage system with self-balancing capability. According to the given start time deltaT of the black start, the output three-phase AC voltage of the cascade energy storage system at the current moment is obtained through the black start command calculation module. The given value of the given value is obtained by the voltage-current double-loop vector control module to obtain the modulation voltage of each link power conversion unit of each phase of abc, and then superimposed with the balanced control voltage component of each link power conversion unit output by the balance control module to obtain each The total modulation voltage of the power conversion units of each chain link in a phase is obtained by the carrier phase-shifted sinusoidal pulse width modulation algorithm module to obtain the pulse driving signals of each power device of the power conversion unit of each series link in each phase. The black start method and application of the cascaded energy storage system with self-balancing capability provided by the present invention can realize the high self-balancing control of the cascaded energy storage system, high-voltage direct-mounted high-efficiency and fast start-up, high power quality, and convenient blackout for centralized scheduling. Startup purpose.

The invention relates to a loader quantitative-variable hydraulic system and aims to overcome the defect that the input power of a variable pump in the existing quantitative-variable hydraulic system accounts for a large amount. The invention further discloses a power control valve. A first cavity in a valve body is communicated with a port PLS and acts on the right end of a main valve element. A valve element spring is disposed at the left end of the main valve element. A valve sleeve sleeves the main valve element. A second cavity is communicated with a port P1 and acts on the right end of the valve sleeve. A third cavity is communicated with a port P and acts on the left end of the valve sleeve. A valve sleeve spring provides leftward elastic force for the valve sleeve. An oil drainage passage communicated with the third cavity and a port T are formed in the main valve element and the valve sleeve. When the main valve element moves leftwards relative to the valve sleeve, the oil drainage passage is communicated. When the main valve element moves leftwards relative to the main valve element, the oil drainage passage is reduced or closed. The power control valve has the advantages that the valve sleeve and the main valve element form a follow-up mechanism, the input power of the variable pump of the loader quantitative-variable hydraulic system can be controlled by the power control valve, and the input power is prevented from accounting for a large amount.

The invention discloses a double circulation mode reactor and a control method for running noise of a reactor. The double circulation mode reactor comprises a main container, a reactor core, a heat exchanger, a main pump, a valve, a steam turbine set and a first branch, wherein the first branch is in parallel connection with the pump; the valve used for controlling the branch to switch on / off is arranged on the first branch; and a switching relation between the valve and the main pump is as follows: in a forced circulation process, the valve is switched off and the cooling agent passes by the main pump, and in a natural circulation process, the valve is switched on and the cooling agent passes by the branch. The reactor has the advantages of compact structure, small volume, low noise, simple reactor operation, wide power adjusting scope and capability of frequently adjusting power according to the requirements and running in a double circulation mode.

The invention discloses an electromagnetic induction heating reaction kettle, which comprises a kettle body for placing materials, a stirring device placed in the kettle body for stirring materials, and a bracket connected to the bottom of the kettle body for supporting the kettle body. The body includes the bottom shell of the kettle body and the upper shell of the kettle body installed on the bottom shell of the kettle body, wherein the electromagnetic induction heating reaction kettle also includes an electromagnetic induction heating coil connected to a high-frequency power supply, and the electromagnetic induction heating coil is suspended placed under the bottom shell of the kettle body and electrically insulated from the bottom shell of the kettle body to heat the bottom shell of the kettle body. The invention utilizes the electromagnetic induction heating technology, and sets the electromagnetic induction heating coil at the bottom of the kettle body as a heating source to replace the steam supply of the boiler room. In the material, the good effect of high efficiency, strong controllability and no pollutants is achieved.